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3 years ago

An element's atomic number is 77. How many protons would an atom of this element have? protons

Physics

2 answers:

bulgar [2K]3 years ago

6 0

Your answer is 55 protons.

salantis [7]3 years ago

5 0

The number of protons would be 77. i know this sounds wrong but it may be correct. i looked it up. the atomic mass would be 192.217 atomic mass units. the name of this is Iridium. the number of neutrons would be 115.
hope this helps u.

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Art [367]

Answer:

Explanation:

If v be the velocity just after the rebound

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3 years ago

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julia-pushkina [17]

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3 years ago

The following three questions refer to a situation in which a driver is in a car that crashes into a solid wall. The car comes t

Andreas93 [3]

Answer:

1) p₀ = 45000 N / s , p₀ '= 1800 , b) I = -45000 N s , I = 1800 Ns

Explanation:

Impulse equals the change in momentum

I = Δp

1) the initial moment of the car

p₀ = M v

p₀ = 1500 30

p₀ = 45000 N / s

the change at the moment is

Δp = 45000

because the end the car is stopped

moment of the person

P₀ ’= m v

p₀ '= 60 30

p₀ '= 1800

D₀ '= 1800

2) of the momentum change impulse ratio

car

I = Δp

I = -45000 N s

person

I = Δpo '

I = 1800 Ns

3) the object that give the momentum to stop the wall motoring

The person is stopped by the impulse given by the car

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4 years ago

An arch is in the shape of a parabola with its vertex at the top. It has a span of 100 feet and a maximum height of 40 feet. Fin

nexus9112 [7]

Answer:36.4 ft

Explanation:

Given

Span of Parabola $L=100 ft$

Maximum height $h=40$

suppose Parabola is of type

$(x-x_0)^2=-4a(y-y_0)$

where $x_0,y_0$ is the center of parabola

$x_0=0, y_0=40$

$x^2=-4a(y-40)$

at $y=0$

$x^2=-4a\times (-40)$

$x^2=160a$

$x=\pm \sqrt{160a}$

and it is given, $2x=100$

$x=50$

$\sqrt{160a}=50$

$a=15.625$

thus $x^2=-4a(y-40)$

at $x=15$

$15^2=-4\times 15.625(y-40)$

$y=36.4 ft$

4 0

3 years ago